GMT to MST Converter

Greenwich Mean Time → Mountain Standard Time · GMT is 7 hours ahead of MST

GMT
—
MST
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GMT and MST are the same time

GMT to MST Conversion Table

GMTMST
12:00 AM12:00 AM
1:00 AM1:00 AM
2:00 AM2:00 AM
3:00 AM3:00 AM
4:00 AM4:00 AM
5:00 AM5:00 AM
6:00 AM6:00 AM
7:00 AM7:00 AM
8:00 AM8:00 AM
9:00 AM9:00 AM
10:00 AM10:00 AM
11:00 AM11:00 AM
12:00 PM12:00 PM
1:00 PM1:00 PM
2:00 PM2:00 PM
3:00 PM3:00 PM
4:00 PM4:00 PM
5:00 PM5:00 PM
6:00 PM6:00 PM
7:00 PM7:00 PM
8:00 PM8:00 PM
9:00 PM9:00 PM
10:00 PM10:00 PM
11:00 PM11:00 PM

Green rows = business hours overlap (9:00 AM – 6:00 PM GMT)

Major GMT Cities
  • London
  • Manchester
  • Edinburgh
  • Birmingham
  • Dublin
  • Cardiff
Major MST Cities
  • Denver, CO
  • Salt Lake City, UT
  • Albuquerque, NM
  • Tucson, AZ
  • Boise, ID
  • El Paso, TX
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GMT vs MST — London to Rocky Mountains

GMT (UTC+0) — UK winter time. London uses BST (UTC+1) from late March to late October.

MST (UTC-7) — Mountain Standard Time, covering Colorado, Utah, Montana, and parts of Idaho and Wyoming. Shifts to MDT (UTC-6) in summer. Arizona stays on MST year-round.

Best overlap: 2:00–5:00 PM GMT = 7:00–10:00 AM MST. London afternoons align well with Denver mornings, making this a workable corridor for UK–US Mountain Zone business.

Frequently Asked Questions

How many hours is GMT ahead of MST?

GMT (UTC+0) is 7 hours ahead of MST (Mountain Standard Time, UTC-7). During US Mountain Daylight Time (MDT, UTC-6), GMT is 6 hours ahead. During UK summer (BST, UTC+1), BST is 8 hours ahead of MST. The gap ranges from 6 to 8 hours depending on DST.

What is 9 AM GMT in MST?

9:00 AM GMT (London winter) is 2:00 AM MST (Denver). A 9:00 AM Denver start equals 4:00 PM GMT in London. The best London–Denver overlap is 2:00–5:00 PM GMT = 7:00–10:00 AM MST, catching Denver's morning while London is in mid-afternoon.

What is the best time to call Denver from London?

The best window for London (GMT) to Denver (MST) calls is 2:00–5:00 PM GMT = 7:00–10:00 AM MST. In UK summer (BST) or US summer (MDT), the window shifts slightly — typically 3:00–6:00 PM BST = 8:00–11:00 AM MDT.

Does Arizona follow MST year-round?

Yes. Arizona (except the Navajo Nation) does not observe Daylight Saving Time and stays on MST (UTC-7) year-round. This means Arizona is always 7 hours behind GMT, while Denver and Salt Lake City shift to MDT (UTC-6) in summer, temporarily becoming only 6 hours behind GMT.